An annoying demo glitch

[Toco]

I've been having this annoying glitch while trying to watch my demos. Whenever I'm on fire, jarated, milked, bleeding etc. there's this glitch that makes my screen looks like minecraft lava that I can kinda see through, if anyone knows how to fix this/has more questions about it, go ahead and comment^^

 

[Melectrome]

Do you have any files in tf/custom? Like, custom huds, mods etc.
Also, do you have any graphics configs?